<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        table {
            width: 500px;
            margin: 100px auto;
            border-collapse: collapse;
            text-align: center;
        }
        
        td,
        th {
            border: 1px solid #333;
        }
        
        thead tr {
            height: 40px;
            background-color: #ccc;
        }
    </style>
</head>

<body>
    <table cellspacing="0">
        <thead>
            <tr>
                <th>姓名</th>
                <th>科目</th>
                <th>成绩</th>
                <th>操作</th>
            </tr>
        </thead>
        <tbody>

        </tbody>
    </table>
    <script>
        // 1.先去准备好学生的数据
        var datas = [{
            name: '魏璎珞',
            subject: 'JavaScript',
            score: 100
        }, {
            name: '弘历',
            subject: 'JavaScript',
            score: 98
        }, {
            name: '傅恒',
            subject: 'JavaScript',
            score: 99
        }, {
            name: '明玉',
            subject: 'JavaScript',
            score: 88
        }, {
            name: '大猪蹄子',
            subject: 'JavaScript',
            score: 0
        }];
        
        //2.在tbody里创建行 根据数组长度
        var tbody = document.querySelector('tbody')
        for(var i=0;i<datas.length;i++){
            //创建 tr 行
            var tr = document.createElement('tr')
            tbody.appendChild(tr)
            //在行内创建单元格 td ,单元格数量取决于每个对象里面的属性个数 
            for(var k in datas[i]){
                //创建单元格
                var td = document.createElement('td')
                //把对象里面的属性值给 td
                td.innerHTML = datas[i][k]
                tr.appendChild(td)
            }
            //3.创建有 删除 两字的单元格
            var td = document.createElement('td')
            td.innerHTML="<a href='javascript:;''>删除</a>"
            tr.appendChild(td)
        }

        //4.创建删除操作
        var as = document.querySelectorAll('a')
        for(var i=0;i<as.length;i++){
            as[i].onclick = function(){
                //点击 a 时删除本行tr
                tbody.removeChild(this.parentNode.parentNode)
            }
        }
    </script>
</body>

</html>